submodule-config.c: use repo_get_oid for reading .gitmodules

Since 76e9bdc437 (submodule: support reading .gitmodules when it's not
in the working tree - 2018-10-25), every time you do

    git grep --recurse-submodules

you are likely to see one warning line per submodule (unless all those
submodules also have submodules). On a superproject with plenty of
submodules (I've seen one with 67) this is really annoying.

The warning was there because we could not resolve extended SHA-1
syntax on a submodule. We can now. Make use of the new API and get rid
of the warning.

It would be even better if config_with_options() supports multiple
repositories too. But one step at a time.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 7 insertions, 13 deletions

diff --git a/submodule-config.c b/submodule-config.c
index 66653e8..4264ee2 100644
--- a/submodule-config.c
+++ b/submodule-config.c
@@ -625,23 +625,16 @@ static void config_from_gitmodules(config_fn_t fn, struct repository *repo, void
 		const struct config_options opts = { 0 };
 		struct object_id oid;
 		char *file;
+		char *oidstr = NULL;
 
 		file = repo_worktree_path(repo, GITMODULES_FILE);
 		if (file_exists(file)) {
 			config_source.file = file;
-		} else if (repo->submodule_prefix) {
-			/*
-			 * When get_oid and config_with_options, used below,
-			 * become able to work on a specific repository, this
-			 * warning branch can be removed.
-			 */
-			warning("nested submodules without %s in the working tree are not supported yet",
-				GITMODULES_FILE);
-			goto out;
-		} else if (get_oid(GITMODULES_INDEX, &oid) >= 0) {
-			config_source.blob = GITMODULES_INDEX;
-		} else if (get_oid(GITMODULES_HEAD, &oid) >= 0) {
-			config_source.blob = GITMODULES_HEAD;
+		} else if (repo_get_oid(repo, GITMODULES_INDEX, &oid) >= 0 ||
+			   repo_get_oid(repo, GITMODULES_HEAD, &oid) >= 0) {
+			config_source.blob = oidstr = xstrdup(oid_to_hex(&oid));
+			if (repo != the_repository)
+				add_to_alternates_memory(repo->objects->odb->path);
 		} else {
 			goto out;
 		}
@@ -649,6 +642,7 @@ static void config_from_gitmodules(config_fn_t fn, struct repository *repo, void
 		config_with_options(fn, data, &config_source, &opts);
 
 out:
+		free(oidstr);
 		free(file);
 	}
 }